code: def test_cov_params(self):
      assert_almost_equal(self.res.bse, self.res_glm.bse, DEC5)
      assert_almost_equal(self.res.bse, self.res_discrete.bse, DEC5)
      # TODO check problem with the following, precision is low,
      # dof error? last t-value is 22, 23, error is around 1% for PoissonMLE
      # this was with constant=1,
      # now changed constant=0.1 to make it less significant and test passes
      # overall precision for tstat looks like 1%
  
      # assert_almost_equal(self.res.tval, self.res_glm.t(), DEC)
      assert_almost_equal(
          self.res.tvalues, self.res_discrete.tvalues, DEC4
      )
      # assert_almost_equal(self.res.params, self.res_discrete.params)
      assert_almost_equal(
          self.res.pvalues, self.res_discrete.pvalues, DEC
      )
  
imports: import pytest
  import numpy
  from numpy.testing import assert_almost_equal
  from scipy import stats
  import statsmodels.api
  from statsmodels.miscmodels.count import PoissonGMLE, PoissonOffsetGMLE, PoissonZiGMLE
  from statsmodels.discrete.discrete_model import Poisson
  from statsmodels.tools.sm_exceptions import ValueWarning
label_desc: Use image node_id 2 for calling the CompareMixin obj's underlying member method code with example usage: obj.test_cov_params() without return types